Drupal\Core\Security\UntrustedCallbackException

Problem/Motivation

Updated site from 8.9.5 to 9.0.5. When I tried to make new content, IMCE threw an error

Steps to reproduce

Drupal\Core\Security\UntrustedCallbackException: Render #pre_render callbacks must be methods of a class that implements \Drupal\Core\Security\TrustedCallbackInterface or be an anonymous function. The callback was Drupal\imce\ImceFileField::preRenderWidget. See https://www.drupal.org/node/2966725 in Drupal\Core\Render\Renderer->doTrustedCallback() (line 96 of /srv/www/htdocs/orcma9/web/core/lib/Drupal/Core/Security/DoTrustedCallbackTrait.php).

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes